Elómë 
Analytic, differentiable transit light curves on Apple Silicon.
Elómë computes exoplanet transit light curves exactly and in closed form, with analytic gradients in every parameter. It runs on MLX, in float32 on the Apple-Silicon GPU through fused Metal kernels, or in float64 on the CPU. It models spherical planets with uniform, linear, quadratic, polynomial and hybrid limb darkening, and oblate and ringed planets and spotted stars with the hybrid laws, which keep their light curves elementary. The frontend follows batman.
Elómë (eh-LOH-meh) is Quenya for "star-dimness".
Installation
pip install elome
Elómë needs a Mac with Apple Silicon for its GPU kernels, Python 3.10 or later, MLX and NumPy.
Example
import numpy as np
import elome
params = elome.TransitParams()
params.t0, params.per, params.rp, params.a = 0.0, 3.0, 0.1, 10.0
params.inc, params.ecc, params.w = 88.0, 0.0, 90.0
params.limb_dark, params.u = "quadratic", [0.4, 0.25]
t = np.linspace(-0.1, 0.1, 1000)
flux = elome.TransitModel(params, t).light_curve(params)
Documentation
elome.readthedocs.io: installation, guides for spherical, oblate and ringed planets and spotted stars, fitting with samplers, tutorials and the API reference.
Citation
If Elómë contributes to your research, please cite the Elómë paper (Kipping, in preparation, Journal of Open Source Software). If you use the hybrid limb-darkening laws, oblate or ringed planets or starspots, please also cite the hybrid-law papers, also in preparation; see Citing Elómë.
License
MIT; see LICENSE.
1 maintainer
Metadata
1 maintainer
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